Why isn't a horse crab a mollusk?

horseshoe crabs are in a class by themselves; they are more closely related to spiders, scorpions, and ticks. They are different from true crabs because they have no antennae and no mandibles (mouth parts for grinding food).

Explanation:

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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